Jewell



(No Model.) 4 Sheets'-Sheet 1L 0. H: JEWEL-L. STRAINER FOR FILTERS.

No. 572,605. Patented Dec. 8, 1896.

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No. 572,605. v Patented Dec. 8, 1896.

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(No Model.) '4 Sheets-Sheet 3.

' O. H. JEWELL.

STRAINER FOR FILTERS.

No. 572,605. Patented Dec. 8,- 1896.

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STRAINBR FOR FILTERS.

Pateni aed Dec. 8, 1896.

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- UNITED STATES PAT NT OFFICE.

OMAR H. .IEIVELL, OF CHIOAGQILLINOIS, ASSIGNOR TO THE 0. H. JEWELL FILTER COMPANY, OF SAME PLACE.

STRAINER FOR FILTERS.

SPECIFICATION formingpart of Letters Patent No. 572,605, dated December 8, 1896.

Application filed February 26, 1896- Serial No. 580,830. (No model.)

To all whom it may concern: verse flow of water it has heretofore been Be it known that I, ()MAR H. JEWELL, a common to utilize the system of pipes and citizen of the United States, residing in Ohistrainers provided for carrying off the filtered cago, in the county of Cook and State of Illiwater, suitable valves being provided where- 5 5 nois, have invented certain new and useful by the water maybe permitted to How through Improvements in Strainers for Filters, of such pipes in either direction.

which the following is a specification, refer- While many filters have been constructed ence being had to the accompanying drawto operate as above described, the operation ings, in which of washing has not been entirely satisfactory, 6o

' Figure 1 is a cross-section of the filter, showowing to the fact that when the water is forced ing the system of strainers in the bottom under the filter-bed for the purpose of washthereof. Fig. 2 isa vertical cross-section of ing it out it will rise at the points which offer the bottom of the filter. Fig. 3 is a vertical the least resistance, thereby cutting channels cross-section on line 3 3 of Fig. at. Fig. 4 is through the filter-bed and washing out cer- 65 an enlarged detail, being a partial plan view tain portions of it, leaving other portions unof the parts shown in Fig. 3. Fig. 5 is a plan disturbed and unwashed, rendering it necesview of one of the branch pipes. Fig. 6 is a sary to make use of agitating devices for the cross-section thereof. Fig. 7 is an enlarged purpose of stirring up the filter-bed during detail, being a plan view of a part of the systhe operation of washing. The use of agi- 7o tem of strainers, part of the covering being tating devices is, however, objectionable, as removed. Fig. 8 is a cross-section on line 8 8 it is necessary when such devices are usedto of Fig. 7. Fig. 9 is a partial plan view showmake the filter of comparatively small size, ing a modification. Fig. 10 is a cross-section as the agitators cannot be successfully used of one of the branch pipes. Fig. 11 is a longiin the larger sizes of filters. Furthermore, 75 tudinal section of the same. Fig. 2 is a plan even with the use of agitators, when the washview of the same. I water is not properly distributed throughout My invention relates to strainers for filters, the filter-bed the granular material is not and particularly to strainers for that class of thoroughly washed, as it is impossible in filters commonlyused forfilteringlarge quanpractice to extend the agitating devices to 80 3o tities of water which make.usc of a granular the bottom of the filter-bed, and consequently filter-bed, through which the water is strained the impurities are not all removed. or filtered. Filters of this class as usually. The objections above pointed out have long constructed comprise a filter-tank of suitable been recognized by filter men, and many atdimensions either having a perforated bottempts have been made to avoid them, but 85 tom or being provided with a series of strainso far as I am aware none of such attempts ers which will serve to prevent the granular have been successful. I have discovered, filter-bed which is placed in the tank from however, that by so constructing the filterbeing carried off through the delivery-pipes, screens that the wash-water will be equally while permitting the filtered water to be cardistributed throughout the bottom of the fil- 0 4o ried ofi. In filtering water in this way the ter under the filter-bed, the wash-water will filter-bed accumulates a large quantity of rise uniformly through the bed, whereby the impure matter, and in order that the water entire filter-bed will be held in suspension may be properly filtered it is necessary at when water is forced up through it, thereby more or less frequent intervals to wash out effectually looseningallthe particles of granu- 5 the granular filter-bed, and this is usually lar material and permitting the impurities to accomplished by directing a current of water he carried up to the surface by the water. A through the filter-bed in an upward direction, further advantage of my improvement is that thereby loosening up the filter-bed and carby thus suspending the filter-bed in the water rying the impurities upward to the surface of its consistency is so reduced that even in 100 the bed, whence they are carried off by a very large filters agitating devices may be suitable waste-pipe. For supplying the resuccessfully used when desired, so that the filtering material may be thoroughly washed out. This is illustrated by the fact that by actual practice I have found that by my improvement I am able to make use of a filter having a capacity of several million gallons per day and to operatethe same as well as it has heretofore been possible to operate one having a capacity of one hundred thousand gallons per day.

For the purpose of further securing the effectual distribution of the wash water throughout the several pipes and in that way furthering the work of equally distributing the wash-water throughout the filter-bed I provide a series of orifices through which the water is discharged into the filter-bed, the combined area of which orifices is equal to the area of the supply-pipe. That is to say, describing the principle as applied to the strainer systems commonly used in filters, the outlet-orifices through which the water is discharged from the strainer-pipes to the filter have a combined area which is equal to'the area of the pipe used to supply water for washing the bed. The water is thereby compelled to be discharged equally through all the outlets in washing, with the result above described. This construction is also advantageous in filtering, as the water is caused to percolate straight down through the filter-bed without forming lateral currents, which would tend to form channels through the filter-bed through which the water might pass without proper filtration.

I will now describe specifically my improvement as applied to a filter.

In the accompanying drawings, 13 indicates the filter-tank, in the lower portion whereof is an inner wall 14:, forming an annular trough 15, as best shown in Figs. 1 and 2.

16 indicates a system of strainers, 17 being a central manifold, to which is connected a series of branch pipes 18, covering the bottom of the filter-bed, as shown in Fig. 1. As

screen 21.

20 of the manifold is a series of orifices 22, through which the water passes into the manifold in filtering and upward out of the manifold in washing the filter-bed.

23 indicates a deflecting-plate secured upon aportion 24 of the bottom of the part 20, which extends upward, as shown in Fig. 3. The deflecting-plate 23 serves to deflect the water as it rises through the orifices 22 and causes it to extend uniformly under the screen 21, through which it rises in washing the filter.

The branch pipes 18 are constructed similarly to the manifold 17, being provided with a U-shaped lower portion 25 and a similarlyshaped upper portion 26, having orifices 27 forthe passage of the water, a deflector 28 to deflect the water, and a screen 29 to prevent the granular matter comprising the filter-bed from entering the pipe.

- As heretofore described, the combined area of the orifices 22 27 is equal to the area of the inlet-pipe, through which the water enters for washing out the filter-bed, and which is indicated in dotted lines at 30 in Figs. 1 and 9.

In Fig. 1 I have shown the manifold 17 as being provided with screen-plates, but instead of this construction a series of disk screens 31 may be used, as shown in Fig. 9, and instead of making the upper portion of the branch pipes with a flat bottom, as shown in Fig. 6, such part may be made inclined, as shown in Figs. 10 and 11. It will be understood, further, that other modifications may be made without departing from the spirit of my invention, as I do not wish to be limited to the specific details shown.

That which I claim as my invention, and desire to secure by Letters Patent, is

A strainer-pipe for filters consisting of two U-shaped portions connected together, the upper portion having one or more water-orifices, a strainer carried by said upper portion, and a deflector between said strainer and said orifice or orifices, substantially as described.

OMAR II. JEVVELL.

lVitnesses:

JOHN L. JACKSON,

ALBERT II. ADAMS. 

